| ssamm |
I can't seem to figure how to do this in a filter...
Let's say we have a picture that is totally desaturated in some parts and has color in other parts. Is there a way to extract all the colored parts from the image and cause the rest to be transparent? I'll post a filter to try to show what I'd like: The Selector on 1 shows an example image. The Selector on 2 shows what I'm trying to get (where the background is tranparent). The Selector on 3 also shows what I want but without the gray. coloralpha.ffxml |
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| Posted: March 10, 2007 12:42 pm | ||
uberzev
 |
Try this...
(note that the three channel modes each produce slightly different results) extract color.ffxml |
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| Posted: March 10, 2007 6:32 pm | ||
| ssamm |
Thanks, uberzev.
That's pretty much the closest I've seen to what I want. And HSY's S extraction did pretty good at loosing the luminosity info. I made another filter to compare them to my frame image. It's selector 2 -- that is the "goal" image effect I was trying to get (of just making the desaturation info invisible). Selectors 3 through 5 use your methods. Then 6 through 8 is where I tried to improve them, but I'm not sure... Anyway, thanks for the help! coloralpha2.ffxml |
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| Posted: March 10, 2007 8:06 pm | ||
| ssamm |
P.S. I'm thinking I'd probably use this type of stuff with the color blend mode anyway, and am noticing this saturation channel idea seems to look pretty okay for me.
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| Posted: March 10, 2007 8:15 pm | ||
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uberzev
|
The color blend mode isn't ideal IMO as it messses with luminosity as well. Try one of the assemble components.
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| Posted: March 10, 2007 8:23 pm | ||
| ssamm |
Thanks for the idea. (It's got me wondering about some experiments I'll have to explore...)
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| Posted: March 10, 2007 9:10 pm | ||
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